B2

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B2

Which form of energy is free during the day, produces no dangerous waste products and will be available for the next 4 billion years? Solar power, of course. Read about some of the things you can do with it.

Ready to fly into space? You've done all the training and put on your space suit. You take the lift up to the top of your rocket. If this was a building, your capsule would be on about the thirtieth floor…